The `_animate()` convention doesn't *really* fit for a function that
also handles input, but I'd rather continue using the same convention
for every blocking multi-frame function.
Part of P0186, funded by [Anonymous] and Blue Bolt.
That's where TH04 crashes in Stage 5 without an EMS driver, but the
code is fine?! (Well, apart from its silly behavior in the Extra
Stage.)
Part of P0169, funded by Blue Bolt.
TH01-style unblitting from the back page of VRAM, in my TH04/TH05?!
It does make sense to suspend double buffering during dialog though,
and you probably don't want to call any custom stage rendering
functions just to effectively unblit a 128×128 pixel area.
Part of P0169, funded by Blue Bolt.
nmlgc